R help - Apr 2012 - How to remove $ (Dollar sign) from string

How do I remove a "$" character from a string sub() and gsub() with
"$" or
"\$" as pattern do not work.
> sub("$","","ABC$DEF")
[1] "ABC$DEF"
> sub("\$","","ABC$DEF")
Error: '\$' is an unrecognized escape in character string starting
"\$"
> sub(\$,"","ABC$DEF")
Error: unexpected input in "sub(\"

Thanks
-- 
Nevil Amos
Molecular Ecology Research Group
Australian Centre for Biodiversity
Monash University
CLAYTON VIC 3800
Australia

	[[alternative HTML version deleted]]

Hi guys,

I have a question. I am running 3 R sessions simultaneously for 
different analysis. I found out that when R quit, only objects in one of 
these sessions was saved in the work space. How can I save objects of 
all 3 R sessions?

Thank you very much.

YA

Dear Nevil,

You have the escape the backslash:
> sub("\\$", "", "ABC$DEF")
[1] "ABCDEF"

I hope this helps,
 John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

On Tue, 10 Apr 2012 21:34:13 +1000
 Nevil Amos <nevil.amos at monash.edu> wrote:
> How do I remove a "$" character from a string sub() and gsub()
with "$" or
> "\$" as pattern do not work.
> > sub("$","","ABC$DEF")
> [1] "ABC$DEF"
> > sub("\$","","ABC$DEF")
> Error: '\$' is an unrecognized escape in character string starting
"\$"
> > sub(\$,"","ABC$DEF")
> Error: unexpected input in "sub(\"
> 
> Thanks
> -- 
> Nevil Amos
> Molecular Ecology Research Group
> Australian Centre for Biodiversity
> Monash University
> CLAYTON VIC 3800
> Australia
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

On 10-Apr-2012 11:34:13 Nevil Amos wrote:
> How do I remove a "$" character from a string sub() and gsub()
with "$" or
> "\$" as pattern do not work.
>> sub("$","","ABC$DEF")
> [1] "ABC$DEF"
>> sub("\$","","ABC$DEF")
> Error: '\$' is an unrecognized escape in character string starting
"\$"
>> sub(\$,"","ABC$DEF")
> Error: unexpected input in "sub(\"
> 
> Thanks
> -- 
> Nevil Amos
> Molecular Ecology Research Group
> Australian Centre for Biodiversity
> Monash University
> CLAYTON VIC 3800
> Australia
  sub("\\$","","ABC$DEF")
  # [1] "ABCDEF"

Logic: "$" is a metacharacter which stands for "the end of the
thing";
as a check of that, instead of your

  sub("$","","ABC$DEF")

do

  sub("$","+","ABC$DEF")
  # [1] "ABC$DEF+"

Therefore "$" needs to be escaped, so you have to use "\";
but since "\" is itself a metacharacter you have to escape
that too, hence "\\$".

Hoping this hrelps,
Ted.

-------------------------------------------------
E-Mail: (Ted Harding) <Ted.Harding at wlandres.net>
Date: 10-Apr-2012  Time: 12:46:59
This message was sent by XFMail

Hi,

Try with a double back slash:
sub("\\$","","ABC$DEF")

HTH,
Ivan

--
Ivan CALANDRA
Universit? de Bourgogne
UMR CNRS/uB 6282 Biog?osciences
6 Boulevard Gabriel
21000 Dijon, FRANCE
+33(0)3.80.39.63.06
ivan.calandra at u-bourgogne.fr
http://biogeosciences.u-bourgogne.fr/calandra


Le 10/04/12 13:34, Nevil Amos a ?crit :
> How do I remove a "$" character from a string sub() and gsub()
with "$" or
> "\$" as pattern do not work.
>> sub("$","","ABC$DEF")
> [1] "ABC$DEF"
>> sub("\$","","ABC$DEF")
> Error: '\$' is an unrecognized escape in character string starting
"\$"
>> sub(\$,"","ABC$DEF")
> Error: unexpected input in "sub(\"
>
> Thanks

Best I understand it yes: I'm not sure if there's an easy way to
combine sessions beyond loading them all into a single session and
then saving that.

Michael

On Tue, Apr 10, 2012 at 8:01 AM, ya <xinxi813 at 163.com>
wrote:
> so, objects in 3 different sessions would be saved separately into 3
> different R image file?
>
>
>
> On 2012-4-10 14:54, R. Michael Weylandt <michael.weylandt at
gmail.com> wrote:
>>
>> You'll need to save them manually to avoid name conflicts --
save.image()
>> is the function to do so but you need to give a file name.
>>
>> Michael
>>
>> On Apr 10, 2012, at 7:41 AM, ya<xinxi813 at 163.com> ?wrote:
>>
>>> Hi guys,
>>>
>>> I have a question. I am running 3 R sessions simultaneously for
different
>>> analysis. I found out that when R quit, only objects in one of
these
>>> sessions was saved in the work space. How can I save objects of all
3 R
>>> sessions?
>>>
>>> Thank you very much.
>>>
>>> YA
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>
>
>

On Tue, Apr 10, 2012 at 7:34 AM, Nevil Amos <nevil.amos at monash.edu>
wrote:
> How do I remove a "$" character from a string sub() and gsub()
with "$" or
> "\$" as pattern do not work.
>> sub("$","","ABC$DEF")
> [1] "ABC$DEF"
>> sub("\$","","ABC$DEF")
> Error: '\$' is an unrecognized escape in character string starting
"\$"
>> sub(\$,"","ABC$DEF")
> Error: unexpected input in "sub(\"
>
Here are three ways:

sub("$", "", "ABC$DEF", fixed = TRUE)
sub("\\$", "", "ABC$DEF")
sub("[$]", "", "ABC$DEF")

-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

In data marted? 10 aprile 2012 13:34:13, Nevil Amos ha
scritto:
> How do I remove a "$" character from a string sub() and gsub()
with "$" or
> "\$" as pattern do not work.
> 
> > sub("$","","ABC$DEF")
> 
> [1] "ABC$DEF"
> 
> > sub("\$","","ABC$DEF")
> 
> Error: '\$' is an unrecognized escape in character string starting
"\$"
> 
> > sub(\$,"","ABC$DEF")
> 
> Error: unexpected input in "sub(\"
> 
> Thanks
You just need a double backslash:
> sub("\\$","","ABC$DEF")
[1] "ABCDEF"